Blade holder



June 14, 193s. AKA FF 2,120,500

BLADE HOLDER Filed June 2, 1937 2 Sheets-Sheet 1' Invento 5 69-9 Mwwg pumm .4 iforneys June 14, 1938. G. MAKAROFF 2,

BLADE I lOLDER Filed June 2, 1937 2 Sheets-Sheet 2 ll," 8 6 T A Z I Q oi I 6 Z4 )4 I 6: ln venior 7 arfidy yf A iiomeys Patented June 14, 1938UNITED STATES PATENT OFFICE 5 Claims.

This invention relates to a blade holdi ng or clamping means for use inconjunction with grinding tools and for supporting the blades at thedesired position of angular adjustment, and in such position ofadjustment as will insure proper contact of the beveled edge of theblade with the grinding disk in a manner to afford an almost perfectsharpening of the blade.

The present invention has reference to certain new and usefulimprovements in that type of blade holding or clamping means forming thesubject matter of Patent No. 2,052,837, granted to me under date ofSeptember 1, 1936, and entitled Grinding device.

An object of the invention is to provide a blade holder capable ofminutest adjustment and which will be found suitable for supporting theblades in contact either with the side or periphery of the grindingwheel.

The invention, together with its objects and advantages, will be bestunderstood from a study of the following description taken in connectionwith the accompanying drawings. wherein:--

Figure 1 is a side elevational View illustrating the application of theinvention when supporting a blade in contact with the periphery of thegrinding wheel.

Figure 2 is a similar view illustrating the application of the inventionwhen supporting the blade in contact with the side of the grindingwheel.

Figure 3 is a bottom plan View of the blade holder with certain partsomitted.

Figure 4 is a sectional View taken substantially on the line 4- 1 ofFigure 3.

Figure 5 is a fragmentary detail sectional view showing clearly theclamping jaws for securing the blade to the holder.

Figure 6 is a detail sectional view taken sub-= stantially on the line6-45 of Figure 4.

Figure '7 is a fragmentary plan view showing in section an adjustingscrew and in plan a graduated disk; and

Figure 8 is a plan view of a pivoted blockcarrying frame hereinaftermore fully referred to.

Referring to the drawings more in detail, it will be seen that in thepreferred embodiment thereof the blade holder comprises generally a bodymember provided with spaced clamps for engagement with the blade to besharpened for holding the blade in contact either with the periphery ofthe grinding disk 23 as shown in Figure 1 or with the side of thegrinding disk as shown in Figure 2, and the body is equipped withsuitable means hereinafter more fully referred to whereby the body ofthe device may be supported at the desired angle to insure the desiredcontact with the beveled edge of the blade being sharpened with theperiphery or side of the grinding disk 23 as the case may be.

As illustrated the body of the blade clamp and holder consists of arectangular block of wood or other suitable material and indicated bythe reference numeral 5. A pair of strips 24 of metal or other suitablematerial has the major portions thereof fitting in grooves providedtherefor in the underface of the body 5 and extending transversely ofthe body. The strips 24 are secured to the body through the medium ofany number of suitable fastening devices such as screws 25, and at theirforward or free ends the strips 24 are rabbeted to form jaws 26.

Cooperating with the jaws 2e are removable jaws 21 which consist ofrectangular pieces of metal or the like having down-turned ends 27overlying the jaws 26 and cooperable therewith for clamping a portion ofthe blade to be sharpened therebetween. The jaws 2? are illustrated asbeing removably secured to the strips 24 through the medium of fingerscrews 28 that thread into suitably aligned openings providedrespectively in the strips 24 and jaws 27. To prevent the jaws Zl fromrotating relative to the jaws 26 strips 24 on their upper sides are.provided with pins 29 that are engaged in notches 30 provided in therear end edges of the jaws 21.

In the bottom or underface thereof the body 5 between the strips 24 isformed with a transverse groove, recess or pocket in which is hinged atone end an adjustment plate 3 that normally fits within the pocket, thelatter being indicated by the reference numeral 1.

An adjustment screw I0 threads through the body 5 to engage the plate 8,and obviously, by

threading the screw 50 downwardly into engage-- ment with the plate 8the body 5 and plate 0 may be moved to relative positions of adjustmentwhereby the body 5 may be adjusted to vary the angular position of theblade during the sharpening thereof without disturbing the set positionof the device or blade holder relative to the grinding wheel.

The structure as just described is substantially identical with thatforming the subject matter of my aforementioned Patent No. 2,052,837.

In accordance with the present invention there is provided on the sideof the body plate 5 a fixed graduated dial H while the adjustment screwi0 is provided with a pointer or index it adapted to be read against thegraduations on the dial ll whereby a very minute adjustment of the bladeholder may be effected to insure the desired proper contact of the bladewith the grinding wheel.

Further, in accordance with the present invention there is provided aframe indicated gen-- erally by the reference numeral 5?. The frame I1is substantially U-shaped and at the free ends of the sides I8 thereofis pivoted to the body block 5 through the medium of the pivot bolt 9which also serves as a pivot for the aforementioned adjustment plate 8.Secured to the crossbar IQ of the frame I! is a block 20, the upper sideof which is beveled as shown, and this block 20 provides a rest for theplate 8 for supporting the plate at an angle to the horizontal. Theframe I! is used, as shown in Figure 2, when it is desired to supportthe blade 2| to be sharpened in contact with the side of the grindingwheel 23. When it is desired to hold the blade 22 in contact with theperiphery of the wheel 23 the frame I1 is swung to the out-of-the-wayposition, as shown in Figure 1.

As shown, the ends of the blade 22 are clamped between the jaws 26, 21,and in actual practice the initial adjustment of the device is efi'ectedby turning the screw ID to place the body block 5 at the desiredposition of angular adjustment. A more minute adjustment of the bodyblock 5 is had through the medium of the scale plate l3 and the indexl5, as is though to be apparent.

Further, by resort to the frame I! and block 20 plate l8 may besupported at an angle to the horizontal so that a wider range ofadjustment may be had.

Further in accordance with the present invention there is secured to theplate 8 an arcuate graduated bar 13 that rises from the plate 8 and isprovided with a slot l4. Secured to the body block 5 is an index member15 having an edge thereof adapted to be read against the graduations onthe scale bar l3, and carried by the index 15 is a screw I6 that isadapted to be threaded home against the bar l3 for securing the bodyblock 5 at the desired angular position of adjustment.

By using the scale bar 13 in conjunction with the dial ll two or moreblades may be sharpened to substantially the same extent so that auniform sharpening of several blades may be effected with this device.

Having thus described the invention, What is claimed as new is:

1. A blade holder of the character described comprising a substantiallyflat body, strips secured to the underside of the body and extendingtransversely thereof, said strips being provided at one end with jawsprojecting beyond an edge of the body, removable jaws cooperable withthe first-named jaws, means for securing the removable jaws to thestrips in operative position to the first-named jaws for clamping theends of a blade to be sharpened therebetween, and said body beingprovided on the underside thereof with a recess, an adjustment platenormally arranged in the recess and hinged at one end to the body, anadjustment screw threaded through the body and engaging the adjustmentplate, a circular scale plate on said body concentric to said screw, andan index carried by said screw and adapted to be read against said scaleplate.

2. A blade holder of the character described comprising a substantiallyfiat body, strips secured to the underside of the body and extendingtransversely thereof, said strips being provided at one end with jawsprojecting beyond an edge of the body, removable jaws cooperable withthe first-named jaws, means for securing the removable jaws to thestrips in operative position to the first-named jaws for clamping theends of a blade to be sharpened therebetween, said body being providedon the underside thereof with a recess, an adjustment plate normallyarranged in the recess and hinged at one end to the body, an adjustmentscrew threaded through the body and engaging the adjustment plate, acircular scale plate on said body concentric to said screw, an indexcarried by said screw and adapted to be read against said scale plate,an arcuate scale plate extending upwardly from said adjustment plate,and said body plate being provided with a slot to accommodate saidarcuate scale plate, an index on said body adapted to be read againstthe graduations on the arcuate scale plate, and interengaging means onsaid index and said arcuate scale plate for securing said body block atthe desired position of adjustment.

3. A blade holder of the character described comprising a substantiallyflat body, strips secured to the underside of the body and extendingtransversely thereof, said strips being provided at one end. with jawsprojecting beyond an edge of the body, removable jaws cooperable withthe first-named jaws for securing the ends of a blade therebetween, saidbody being provided on the underside thereof with a recess, anadjustment plate normally arranged within the recess and hinged at oneend to the body, an arcuate graduated scale plate extending upwardlyfrom said adjustment plate and through a slot in said body,

and an index mounted on said body and adapted to be read against thegraduations on said scale plate in effecting an angular adjustment ofthe body relative to said adjustment plate.

4. A blade holder of the character described comprising a substantiallyfiat body, strips secured to the underside of the body and extendingtransversely thereof, said strips being provided at one end with jawsprojecting beyond an edge of the body, removable jaws cooperable withthe first-named jaws for securing the ends of a blade therebetween, saidbody being provided on the underside thereof with a recess, anadjustment plate normally arranged within the recess and hinged at oneend to the body, an arcuate graduated scale plate extending upwardlyfrom said adjustment plate and through a slot in said body, and an indexmounted on said body and adapted to be read against the graduations onsaid scale plate in effecting an angular adjustment of the body relativeto said adjustment plate, said scale plate being provided with anarcuate slot, and a screw carried by said index and working in said slotand adapted to be threaded home into binding engagement with said scaleplate for securing the body at the desired angle of inclination.

5. A blade holder of the character described comprising a substantiallyfiat body, jaw members provided at one edge of said body for sup portinga blade to be sharpened in substantially spaced parallel relation withone edge of said body, an adjustment plate hinged at one end thereof tothe underside of said body, a substantially U-shaped frame includingside members pivoted at one end thereof to said body at opposite ends ofsaid body and a cross member connecting the free ends of said sidemembers, and a rest for said adjustment plate carried by said crossmember and having a beveled upper surface upon which said adjustmentplate is adapted to seat, as and for the purpose specified.

GREGORY MAKAROFF.

